Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc040a267dc2a32…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 01:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02448bd9074153e3d55994bba5fe0837 SHA-1: 21ea127b1083eadaa99469a91795b63fe32e12d6 SHA-256: efc040a267dc2a324bc3426423b3ba2c96f4b3cb9dde3f3bc8fe83fbf0221603
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to trick users into downloading further malware or unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://akcjonariusz.com/UserFiles/file/78157773588.pdf In PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/laropaximuwulufizetiw.pdfIn PDF document text
    • https://aokman-drive.com/d/files/dulosokozaruwuziraka.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/62786024588.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138274e916a7---bituxijanawimotoneviv.pdfIn PDF document text
    • https://birudongker.com/contents/files/80565256801.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/bewalisug.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd70b01ec---58778010354.pdfIn PDF document text
    • https://blokhol.com/upload/files/tepotebidimedavalulibara.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/jexibexisapovufekuxizezas.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/59208364254.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/fudugutuduwej.pdfIn PDF document text
    • http://julianina.dk/upload/file/28604522281.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130acd1e8058---61914123329.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gedoxoxemunaxeperokaf.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/86955106868.pdfIn PDF document text
    • https://datajournonepal.org/files/suxobozozogerozo.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/34254598476.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/33580068830.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/86847232146.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/waximufeza.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/86310599822.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/25718694941.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/65192020875.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/womidexepas.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83cae945ccd09f17cd6d9ad024153b36/dusopafosomirujumezul.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/52506596220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+pocket+edition+for+android+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 10616 bytes
SHA-256: dd92a860161eca2653031b9447ff208bfc595f0a8955c9b8e8c04e9ab541fe03
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16704 bytes
SHA-256: 3f9d00d4cee851b6545650a2a19ee24c99ba3c59bc96d7b3519a8a77719c543c

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